| PPR | physician-patient relation; physician payment reform; posterior primary ramus; Price precipitation r... |
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| PR | by way of the rectum [Lat. per rectum]; far point [of accommodation] [Lat. punctum remotum]; palindr... |
| pRCA | posterior right coronary artery |
| PSA | parasternal short axis; pleomorphic salivary gland adenoma; polyethylene sulfonic acid; polysacchari... |
| PSC | patient services coordination; Porter-Silber chromogen; posterior subcapsular cataract; primary scle... |
| posterior median fissure of spinal cord | A shallow furrow in the median line of the posterior surface of the spinal cord. Synonym: sulcus medianus posterior medullae spinalis, posterior median fissure of spinal cord. (05 Mar 2000) |
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| posterior median fissure of the medulla oblongata | The longitudinal groove marking the posterior midline of the medulla oblongata; continuous below with the posterior median sulcus of the spinal cord. Synonym: sulcus medianus posterior medullae oblongatae, posterior median fissure of the medulla oblongata. (05 Mar 2000) |
| posterior median line | The line of intersection of the midsagittal plane with the posterior surface of the body. Synonym: linea mediana posterior. (05 Mar 2000) |
| posterior median sulcus of medulla oblongata | The longitudinal groove marking the posterior midline of the medulla oblongata; continuous below with the posterior median sulcus of the spinal cord. Synonym: sulcus medianus posterior medullae oblongatae, posterior median fissure of the medulla oblongata. (05 Mar 2000) |
| posterior median sulcus of spinal cord | A shallow furrow in the median line of the posterior surface of the spinal cord. Synonym: sulcus medianus posterior medullae spinalis, posterior median fissure of spinal cord. (05 Mar 2000) |
| posterior mediastinal arteries | Numerous small arteries supplying the pleura and lymph nodes of the posterior mediastinum. Synonym: rami mediastinales aortae thoracicae, posterior mediastinal arteries. (05 Mar 2000) |
| posterior mediastinal lymph nodes | Nodes located along the thoracic aorta; they receive vessels from the oesophagus, diaphragm, liver and pericardium and send efferents to the thoracic duct and bronchomediastinal lymphatic trunk(s). Synonym: nodi lymphatici mediastinales posteriores. (05 Mar 2000) |
| posterior mediastinal mass | <radiology> Mnemonic: HALOVEEN, haematoma, abscess, lymph nodexs, osteophyte, vertebral (metastasis, plasmacytoma), extramedullary haematopoesis, oesophagus, neurogenic (12 Dec 1998) |
| posterior mediastinum | Lies between the pericardium and the vertebral column, below the level of the T4/5 intervertebral disc. It contains the descending aorta, thoracic duct, oesophagus, azygos veins, and vagus nerves. Synonym: mediastinum posterius, postmediastinum. (05 Mar 2000) |
| posterior medullary velum | A thin sheet of white matter, hidden by the cerebellar tonsil, attached along the peduncle of the flocculus and, at and near the midline, to the nodulus of the vermis; it is continuous caudally with the epithelial lamina and choroid plexus of the fourth ventricle. Synonym: velum medullare inferius, posterior medullary velum, Tarin's valve, valvula semilunaris tarini, velum semilunare, velum tarini. (05 Mar 2000) |
| posterior meningeal artery | <anatomy, artery> Origin, ascending pharyngeal; distribution, dura mater of posterior cranial fossa; anastomoses, branches of middle meningeal and vertebral. Synonym: arteria meningea posterior. (05 Mar 2000) |
| posterior meniscofemoral ligament | <anatomy> The band that passes posterior to the posterior cruciate ligament extending between the medial condyle of the femur and the posterior crus of the lateral meniscus. Synonym: ligamentum meniscofemorale posterius, ligamentum cruciatum tertium genus, ligamentum menisci lateralis, Wrisberg's ligament. (05 Mar 2000) |
| posterior myocardial infarction | Infarction involving the posterior wall of the heart; also formerly used erroneously of infarction's involving the inferior or diaphragmatic surface of the heart. (05 Mar 2000) |
| posterior naris | The opening into the nasopharynx of the nasal cavity on either side. Synonym: isthmus pharyngonasalis, posterior naris, postnaris. Origin: Mod. L. Fr. G. Choane, a funnel (05 Mar 2000) |
| posterior nasal spine | The sharp posterior extremity of the nasal crest of the hard palate. Synonym: spina nasalis posterior, posterior palatine spine. (05 Mar 2000) |